Song Jun created SPARK-20013:
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Summary: merge renameTable to alterTable in ExternalCatalog
Key: SPARK-20013
URL: https://issues.apache.org/jira/browse/SPARK-20013
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.2.0
Reporter: Song Jun
merge renameTable to alterTable in ExternalCatalog has some reasons:
1. In Hive, we rename a Table by alterTable
2. Currently when we create / rename a managed table, we should get the
defaultTablePath for them in ExternalCatalog, then we have two defaultTablePath
logic in its two subclass HiveExternalCatalog and InMemoryCatalog, additionally
there is also a defaultTablePath in SessionCatalog, so till now we have three
defaultTablePath in three classes.
we'd better to unify them up to SessionCatalog
To unify them, we should move some logic from ExternalCatalog to
SessionCatalog, renameTable is one of this.
while limit to the simple parameters in renameTable
{code}
def renameTable(db: String, oldName: String, newName: String): Unit
{code}
even if we move the defaultTablePath logic to SessionCatalog, we can not pass
it to renameTable.
So we can merge the renameTable to alterTable, and rename it in alterTable.
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